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In August 1905 Schlieffen was kicked by a companion's horse, making him 'incapable of battle'. During his time off, now at the age of 72, he started planning his retirement. His successor was yet undetermined.
According to Wikipedia (please let me know if there are better sources on Schlieffen and how he died, retired, etc.), the aforementioned incident ultimately led to Schlieffen's retirement.
What if Schlieffen avoids this incident? Could he remain Chief of the GGS until WW1, and ultimately implement a Schlieffen Plan where Germany remains on the defensive on both fronts and conducts offensive operations only within the context of counter-attacks?
Alternatively, could he secure a successor to the Chief of the GGS who would implement policies similar to the aforementioned?
How would a WW1 with Germany on the defensive on both fronts play out?